#!/bin/bash

GDAL_TILE_PROCESSES=16
GDAL_TILE_ZOOMS=8-14
GDAL_SAMPLING_WARP=cubic
GDAL_SAMPLING_TILE=antialias

# Create virtual dataset with coordinates
gdal_translate -of VRT -a_srs EPSG:4326 -outsize 300% 300% -gcp 0.0 0.0 25.2780402 57.07103866 -gcp 21600.0 0.0 25.29032954 56.98589474 -gcp 21600.0 21792.0 25.12839551 56.97806597 -gcp 0.0 21792.0 25.11616261 57.0651808 GX220/GX_220_SK_frame_574.jpg GX_220_SK_frame_574.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "672.0 2208.0\n672.0 19056.0\n20976.0 19056.0\n21120.0 1872.0" | \
  gdaltransform -tps -output_xy GX_220_SK_frame_574.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_220_SK_frame_574.vrt GX_220_SK_frame_574.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_220_SK_frame_574.cut.vrt GX_220_SK_frame_574.xyz